.year("timestamp")
.month("timestamp")
.day("timestamp")
.build();
unbounded = new MarkerRange(new MarkerComparator(strategy));
keys = Lists.newArrayList();
for (Object year : Arrays.asList(2012, 2013)) {
for (Object month : Arrays.asList(9, 10, 11, 12)) {
for (Object day : Arrays.asList(22, 24, 25)) {